package studienarbeit;

import java.awt.*; 
import javax.swing.*; 
 
public class N_Vertex extends JPanel 
{ 
  protected void paintComponent( Graphics g ) 
  { 
    //VertexDrawer.drawThickLine( 1, 1, 100, 100, 5, g); 
    VertexDrawer.drawThickLine( 30, 30, 200, 200, 20, g);
  } 
 
  public static void main( String[] args ) 
  { 
    JFrame f = new JFrame(); 
    f.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); 
    f.add( new N_Vertex() ); 
    f.setSize( 400, 400 ); 
    f.setVisible( true ); 
  } 
} 
 
class VertexDrawer 
{ 
    
  public static void drawThickLine( int x, int y, int x2, int y2, int thickness, Graphics g ) {
        int b = Math.round( thickness /2), deltax, deltay;
        double angle;
        
        angle = Math.atan( (double)((y2-y)/(x2-x)) );
        deltay = (int)Math.round( (Math.cos(angle)*b) );
        deltax = (int)Math.round( (Math.sin(angle)*b) );
        Polygon p = new Polygon();
        
        p.addPoint( x-deltax, y+deltay );
        p.addPoint( x+deltax, y-deltay );
        p.addPoint( x2+deltax, y2-deltay );
        p.addPoint( x2-deltax, y2+deltay );
        g.fillPolygon( p );
    }
}